At what point have I unsulated a wall enough where I start to get less heat loss.?
Maybe someone can tell me, I have an old house I've got torn down to the studs in spots. As I insulate I have been wondering at what point does my insulation and heat loss start to balance so further insulation starts to reduce heat loss. I'm sure in the beginning the heat loss over the area of uninsulated wall is such that even though I add insulation the amount of heat loss hasn't changed, I'm curious at what point does it start to change. I might be over thinking it or I might be wrong but I'd appreciate it if someone with more physics and math knowledge than I have could explain it.
- StevenLv 710 months ago
Assuming you have insulated the walls, floor and ceiling, your windows and doors are probably the culprit. Single pain glass is useless, double pain glass is fair, triple pain glass is recommend. The best insulation requires staggered studs so that no stud contacts both sides of the wall. Be sure your walls have a poly vapor barrier and all electrical outlets are sealed. Heat is like water in a bucket: there is no point adding more insulation to one side if there is a big hole elsewhere..
- D gLv 710 months ago
to properly insulate you have to cut out air flow through walls and recepticles and aother oapenings too.. you will probably not be too far.. but there is another consideration as you seal the house to heat loss you must make sure aire flows in through heaters or other vents to allow air to be exchanged
- oil field trashLv 710 months ago
You just fill in between the studs with what ever thickness matches the stud size. An old house is probably 3.5 inches. of thickness. Many newer homes or additions to older ones can be 5.5 inches.
What amount is optimum is a complex calculation since the place where you live, the cost of energy and even the square footage of walls or ceiling has an impact on the optimum amount of insulation. The type of insulation and its cost is the other variable.
- Anonymous10 months ago
Heat loss starts going down with the first layer of insulation. the amount that every extra layer reduces is less and less.
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- billrussell42Lv 710 months ago
You are overthinking it.
Any insulation helps, there is no cutoff point as you imply. The relationship is very linear. Two inches of insulation provides half the heat loss as one inch, for example. 4 inches 1/4 the loss of one inch. or, 4 inches of R40 provides half the heat loss as 4 inches of R20, to make up numbers. As others said, use the insulation rating (or higher) required in your area. Be sure to seal around the edges, outlets, pipes, etc.
- 異域秦後人Lv 710 months ago
INSTALL AT LEAST ONE FOOT OR MORE THICKNESS FIBER GLASS TO COVER THE WHOLE WALL. AFTER COMPLETION, TEST THE WALL TEMPERATURE WITH A LASER BEAM TYPE TEMPERATURE MEASUREMENT TOOL TO MAKE SURE THERE IS NO HEAT LEAKAGE ALONG THE WALL,JOINTS AND EDGES.
- PhilomelLv 710 months ago
This is dependent on where you live and the temperatures, Hi and low, in your area.
You may want to ask at your city building department. Too much is a waste of time and money, too little won't pay back sufficiently.
Make sure you include a moisture barrier.
Don't commit anything to the building department. They may want a building permit. Just tell them you are researching for an article in a paper or book.
To answer the basic question, any amount of insulation reduces heat loss.
There is a basic point where more is uneconomical.
- babyboomer1001Lv 710 months ago
R19 is standard for walls - code. R40 is standard for ceilings. If you don't want to lose square footage in your home, don't add to it. Just use the R19. That's standard in the desert so it is probably code in the north too. Check the code where you live and use that, just in case it is more than R19. You should really put in what's code in your area.Source(s): Have done a lot of renos and addition work.
- MorningfoxLv 710 months ago
The insulation starts working, a little bit, as soon as you put some on. It's not like putting on a bit makes things worse. But the effect is pretty small until you get to where 10% - 20% is covered. Even then the effect is small. You need insulation on at least 50% of the outside walls and ceiling, to make it really worthwhile.